RemSrc = App.Path & "\" & App.EXEName & ".exe" This is to check where the file is located at the moment so you can atleast copy something.
RemDes = Environ$("systemdrive") & "\Users\" & Environ$("username") & "\desktop\" & app.exename & ".exe" This is the folder or place where you want to the the file.

He clearly states that this is an exploit you dl it and unzipped it at your own risk. It is not his fault that you don't understand what this is. Thanks for the pack I am going to take a look at this in my sandbox to see if I can learn more on this.